JPWO2018083758A1 - Generator motor control device and generator motor control method - Google Patents

Abstract

A control device for a generator motor having an armature winding and a field winding, a bridge circuit for energizing the armature winding, a field circuit for energizing the field winding, and a bridge circuit And an energization control device that controls energization of the field circuit, and the energization control device switches the power generation mode and the drive mode in accordance with an external command to control the generator motor to the field winding. And the vector control of the energization amount to the armature winding so as to compensate the fluctuation of the field current.

Description

  The present invention is mainly mounted on a vehicle, and operates as a motor at the time of engine startup or torque assist, and also operates as a generator after startup, and a control device for a generator motor having an armature winding and a field winding. The present invention relates to a method for controlling a generator motor.

  In recent years, for the purpose of improving fuel efficiency and conforming to environmental standards, vehicles have been developed that are equipped with a generator motor, stop the engine when the vehicle stops, and perform so-called idle stop that restarts when starting. Such a vehicular generator motor is required to be small in size, low in cost and high in torque. For this reason, a winding field type generator motor is often used as a generator motor for a vehicle.

  In general, a generator motor for a vehicle controls only the energization amount to the field winding, and supplies a direct current to the vehicle by diode rectification without controlling the energization amount of the armature winding. It operates while switching between a power generation mode and a drive mode in which a drive torque is generated by controlling the energization amount to the field winding and vector-controlling the energization amount to the armature winding.

  A field winding generator motor that performs such an operation needs to pass a large current through the armature winding. For this reason, the field winding generator motor for a vehicle is designed such that the inductance of the field winding is larger than the inductance of the armature winding. As a result, the time constant of the field current is larger than the time constant of the armature current. Therefore, if the energization command to the armature winding and the field winding is changed simultaneously, the response speed of the field current is slower than the response speed of the armature current, and the field current command value and the actual field current There is a difference between

  When such a field current response delay occurs when switching between power generation mode and drive mode, the magnitude of torque before and after switching from the power generation side to the drive side or from the drive side to the power generation side Cannot be controlled. As a result, an unintended torque is generated, an excessive force is applied to the belt and the engine, and the belt may be worn and engine control may become unstable.

  To solve such problems, a technology that suppresses sudden torque fluctuation, prevents belt wear, and improves riding comfort by providing a period in which the target torque is zero in the process of switching between power generation mode and drive mode. Has been proposed (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2015-67225

However, the prior art has the following problems.
When such control is performed, when it is desired to quickly switch modes, for example, when driving for engine cranking and then immediately generating power to suppress a decrease in battery voltage, Electric power cannot be generated during the period when the target torque is zero. As a result, the control of the electric load of the vehicle may be affected.

  As described above, the switching control according to Patent Document 1 has a problem that it cannot quickly shift to the next mode after the drive is stopped.

  The present invention was made to solve the above-described problems, suppresses a rapid torque fluctuation at the time of switching between the power generation mode and the drive mode, and is not limited to the time constant of the field current, It is an object of the present invention to obtain a generator motor control device and a generator motor control method capable of quickly changing modes.

  A control device for a generator motor according to the present invention is a control device for a generator motor having an armature winding and a field winding, and includes a switching element for a positive arm and a switching element for a negative arm, A bridge circuit that energizes the armature winding, a field circuit that energizes the field winding, and an energization control device that controls energization of the bridge circuit and the field circuit. A power generation mode that generates power by supplying torque from the vehicle and supplies power to the vehicle electrical load and charges the battery, and a drive mode that restarts and assists the engine by generating drive torque by supplying power from the battery The energization control device controls the energization amount to the field winding when switching between the power generation mode and the drive mode in accordance with an external command. Together, and it performs vector control of the energization amount of the armature winding to compensate for variations of the field current flowing through the field winding.

  Further, the generator motor control method according to the present invention is applied to control of a field winding type generator motor including an armature winding and a field winding, and is supplied with torque from a vehicle to generate power. Switching between two modes: a power generation mode for supplying power to the vehicle electrical load and charging the battery, and a drive mode for generating driving torque when power is supplied from the battery to restart and assist the engine A method of controlling a generator motor when control is performed by an energization control device, wherein the energization control device performs an energization amount to a field winding when switching between a power generation mode and a drive mode according to an external command. In parallel with the control in the first step and the control in the first step, the vector control of the energization amount to the armature winding so as to compensate the fluctuation of the field current flowing in the field winding In which a second step of performing.

  According to the present invention, at the time of switching between the power generation mode and the drive mode of the generator motor, there is provided a configuration for controlling the energization amount of the armature winding without setting the field current flowing in the field winding to zero. Yes. As a result, a control device for a generator motor and a generator motor that can suppress a rapid torque fluctuation at the time of switching between the power generation mode and the drive mode, and can perform mode transition quickly without being limited by the time constant of the field current. The control method can be obtained.

It is a block diagram of the whole system at the time of mounting the control apparatus of the winding field type generator motor in Embodiment 1 of this invention in a vehicle. It is a block diagram which shows the structure of the generator motor 102 in Embodiment 1 of this invention. It is the figure which showed the time transition of the value of each part at the time of switching operation from drive mode to power generation mode in the conventional generator motor control apparatus. It is the figure which showed the time transition of the value of each part at the time of switching operation from a drive mode to a power generation mode in the control apparatus of the generator motor which concerns on Embodiment 1 of this invention. It is the figure which showed the time transition of the value of each part at the time of switching operation from drive mode to power generation mode in the control apparatus of the generator motor which concerns on Embodiment 2 of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a generator motor control device and a generator motor control method of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of the entire system when a control device for a winding field type generator motor according to Embodiment 1 of the present invention is mounted on a vehicle. In FIG. 1, a vehicular internal combustion engine 101 is coupled to a generator motor 102 in a state where torque can be transmitted and received by a power transmission unit 104 via a shaft or pulley and a belt. The generator motor 102 is electrically connected to a battery or a capacitor 103.

  The generator motor 102 supplies power to the electric load of the vehicle, or a battery that operates as a motor for starting and assisting the vehicle internal combustion engine 101 in accordance with a command from a host engine control device that is omitted in FIG. And a power generation mode that operates as a power generator for charging 103.

  The battery or capacitor may be shared with other vehicle loads, or may be dedicated to the generator motor 102.

  FIG. 2 is a block diagram showing the configuration of the generator motor 102 according to the first embodiment of the present invention. In FIG. 2, the generator motor 102 includes a rotating electric machine 200, an energization control device 210, a bridge circuit 220, and a field circuit 230.

  The energization control device 210 controls the bridge circuit 220 and the field circuit 230 and energizes the armature winding 201 and the field winding 202 of the rotating electrical machine 200, whereby the generator motor 102 serves as an electric motor. Functions and functions as a generator are realized.

  The rotating electrical machine 200 has an armature winding 201 and a field winding 202, and when each winding is energized, it generates torque for starting and assisting the internal combustion engine 101, or current for charging the battery. Is generated. The rotating electrical machine 200 further includes a rotational position sensor 203 such as an encoder or a resolver.

  The bridge circuit 220 includes a three-phase inverter circuit, a three-phase bridge rectifier circuit, and armature current sensors 227a to 227c. The three-phase inverter circuit is configured by three-phase bridge connection of upper arm switching elements 223a to 223c and lower arm switching elements 224a to 224c, which are switching elements such as MOSFETs or IGBTs.

  The three-phase bridge rectifier circuit includes upper arm diodes 225a to 225c and lower arm diodes 226a to 226c that are connected in antiparallel to the switching elements. The armature current sensors 227a to 227c detect the armature current flowing from each phase to the armature winding 201.

  The energization control device 210 performs on / off control of each switching element constituting the bridge circuit 220 according to the energization signal, and performs energization control to the armature winding 201.

  In FIG. 2, the upper arm diodes 225a to 225c and the lower arm diodes 226a to 226c are described as independent elements. However, parasitic diodes existing inside the upper arm switching elements 223a to 223c and the lower arm switching elements 224a to 224c may be used in place of these diodes.

  The field circuit 230 includes an upper arm switching element 231, a lower arm switching element 232, and a field current sensor 233 that detects a current flowing through the field winding 202. Then, the energization control device 210 performs on / off control of each switching element constituting the field circuit 230 in accordance with the energization signal, and performs energization control to the field winding 202.

  In FIG. 2, the rotary electric machine 200 is illustrated as a three-phase winding field AC rotary electric machine having a three-phase armature winding 201 and a field winding 202. However, the winding method and the number of phases of the wound field type AC rotating electric machine may be different from the configuration of FIG.

  Next, the operation at the time of mode switching of the generator motor control device according to the present invention will be described in detail with reference to the drawings. Consider a case where a power generation mode command is given from a host engine control device while the generator motor is operating in the drive mode for engine restart or torque assist.

  In this case, the power supply control device 210 calculates a control command value in the power generation mode based on the torque command TRQref given from the host engine control device, the B terminal voltage VB in the control state, and the rotational speed NMG.

  Here, the first embodiment has a technical feature in that the armature current vector control is continued without stopping energization to the armature winding 201 when the mode is switched from the drive mode to the power generation mode. Have.

  FIG. 3 is a diagram illustrating a time transition of values of respective units when a switching operation from the drive mode to the power generation mode is performed in the conventional generator motor control device. On the other hand, FIG. 4 is a diagram showing the time transition of the value of each part when performing the switching operation from the drive mode to the power generation mode in the generator motor control device according to Embodiment 1 of the present invention. is there.

  Specifically, FIGS. 3 and 4 show command values and generator motor output values for torque, field current, d-axis current, and q-axis current.

  In the conventional mode switching operation shown in FIG. 3, the energization to the armature winding is stopped at the moment of switching from the drive mode to the power generation mode corresponding to time t2 in FIG. Therefore, after time t2, a torque error, that is, a torque fluctuation due to the delay of the field current If with respect to the field current command Ifref occurs.

  On the other hand, in the mode switching operation of the first embodiment, energization to the armature winding 201 is continued even after switching to the power generation mode, which corresponds to time t2 and after in FIG. That is, the energization control device 210 controls the power generation torque by controlling the armature current even after the time t2.

  The energization control device 210 provides the d-axis current command Idref and the q-axis current command Iqref to the bridge circuit 220 so as to compensate for the delay of the field current If with respect to the field current command Ifref, thereby reducing the torque error. Control that does not occur can be performed.

  Further, when the mode is switched from the power generation mode to the drive mode, the energization control device 210 starts vector control of the armature current when a drive mode command is given. By such control, the energization control device 210 controls the bridge circuit 220 so as to compensate for the delay of the field current If with respect to the field current command Ifref in the same manner as when switching from the drive mode to the power generation mode. By giving the d-axis current command Idref and the q-axis current command Iqref, it is possible to perform control without causing a torque error.

  As described above, according to the first embodiment, the armature is compensated based on the generated torque command and the current field current so as to compensate for the delay of the field current with respect to the field current command generated at the time of mode switching. It has a configuration for controlling the energization amount to the winding. As a result, it is possible to realize a generator motor control device capable of suppressing torque fluctuation due to the difference between the field current and the field current command.

Embodiment 2. FIG.
In the second embodiment, a specific example in which the field current command is different from that in the first embodiment will be described. The control operation in the second embodiment is the same as that of the first embodiment except for the operation of the energization control device 210 at the time of mode switching, and will be described below mainly on the differences.

  FIG. 5 is a diagram showing a time transition of values of respective units when a switching operation from the drive mode to the power generation mode is performed in the generator motor control device according to Embodiment 2 of the present invention. Specifically, FIG. 5 shows command values and generator motor output values for torque, field current, d-axis current, and q-axis current.

  The energization control device 210 according to the second embodiment has a further technical feature in that the field current command Ifref when switching from the drive mode to the power generation mode is changed in accordance with the time constant of the field winding. doing. Therefore, there is no delay between the field current command Ifref and the field current If.

  Further, the energization control device 210 according to the second embodiment, in the same way as the first embodiment, responds to the field current command generated at the time of mode switching based on the power generation torque command Tref and the current field current If. The amount of current supplied to the armature winding is controlled so as to compensate for the delay of the field current.

  In the specific example of FIG. 5, the energization control device 210 performs the d-axis current command Idref and the energization control so that the energization to the armature winding 201 is continued even after switching to the power generation mode, which corresponds to after the time t2. The output torque is controlled by the q-axis current command Iqref. As a result, no torque error occurs.

  Compared with FIG. 4 in the first embodiment, the field current in FIG. 5 changes the field current command Ifref when switching from the drive mode to the power generation mode in accordance with the time constant of the field winding. As a result, the field current is controlled so as not to become zero, and as a result, the amount of energization to the field circuit is prevented while the field current is not zero when switching the mode. And the vector control of the energization amount to the armature winding.

  As described above, according to the second embodiment, based on the current field current of the power generation torque command, the armature winding is compensated so as to compensate for the delay of the field current with respect to the field current command generated at the time of mode switching. It has a configuration for controlling the amount of current applied to the wire. Furthermore, the second embodiment also has a configuration in which the field current command at the time of mode switching is changed in accordance with the time constant of the field winding. As a result, it is possible to realize a generator motor control device capable of suppressing torque fluctuation due to the difference between the field current and the field current command.

  In the first and second embodiments described above, the armature current vector control is described as being performed on the dq coordinates. However, the present invention is not limited to such control on dq coordinates, and control may be performed on three-phase coordinates or other rotational coordinates.

  Further, in the above-described first and second embodiments, the case where the field current and the armature current are controlled so as not to cause the torque fluctuation has been described. On the other hand, the field current and the armature current may be controlled so that the fluctuation of the direct current IDC does not occur. Also in this case, as a result, it is possible to achieve the object of the present application, in which rapid torque fluctuation at the time of mode switching is suppressed and mode switching is performed more quickly than in the prior art.

  In the second embodiment, the case where the field current command at the time of mode switching is changed in accordance with the time constant of the field winding has been described. However, the present invention is limited to such field current control. It is not something. At the time of mode switching, instead of changing the field current command in accordance with the time constant of the field winding, while controlling the amount of energization to the field circuit and armature winding while preventing the field current from becoming zero. The effect of preventing the delay between the field current command and the field current can also be obtained by performing the vector control of the energization amount to the line.

  Alternatively, when the mode is switched, instead of changing the field current command according to the time constant of the field winding, the field current is controlled at a fixed value so that the field current is fixed to a constant value. In addition, by performing vector control of the energization amount to the armature winding, it is possible to obtain an effect that does not cause a delay between the field current command and the field current.

  DESCRIPTION OF SYMBOLS 101 Internal combustion engine for vehicles, 102 Generator motor, 103 Battery (or capacitor), 200 Rotating electric machine, 201 Armature winding, 202 Field winding, 203 Rotation position sensor, 210 Current supply control apparatus, 220 Bridge circuit, 223a-223c Upper arm switching element, 224a to 224c Lower arm switching element, 225a to 225c Upper arm diode, 226a to 226c Lower arm diode, 227a to c Armature current sensor, 230 Field circuit, 231, 232 Field circuit switching element, 233 Field current sensor.

Claims (5)

A control device for a generator motor having an armature winding and a field winding,
A bridge circuit composed of a switching element of the positive arm and a switching element of the negative arm, and energizing the armature winding;
A field circuit for energizing the field winding;
An energization control device that performs energization control of the bridge circuit and the field circuit,
The generator motor is supplied with torque from the vehicle to generate electric power, and generates power by supplying electric power to the vehicle electrical load and charging the battery. And a driving mode for assisting, and two modes:
The energization control device controls the energization amount to the field winding and switches the field flowing in the field winding when switching between the power generation mode and the drive mode in accordance with an external command. A control device for a generator motor that performs vector control of an energization amount to the armature winding so as to compensate for fluctuations in current. The energization control device controls the amount of energization to the field circuit and the armature winding while changing the field current command according to the time constant of the field winding when performing the mode switching. The generator motor control device according to claim 1, wherein vector control of an energization amount is performed. The energization control device controls the energization amount to the field circuit and the vector control of the energization amount to the armature winding while preventing the field current from becoming zero when performing the mode switching. The control apparatus of the generator motor of Claim 1. The energization control device controls the energization amount to the field winding so that the field current is fixed to a constant value when the mode is switched, and the energization amount to the armature winding is controlled. The generator motor control device according to claim 1, wherein vector control is performed. Applied to the control of a field winding type generator-motor that includes an armature winding and a field winding, and is supplied with torque from the vehicle to generate power, supply power to the vehicle electrical load, and charge the battery Of the generator motor when the energization control device performs switching control between the two modes: a power generation mode in which power is supplied from a battery to generate a drive torque by generating power and restarting and assisting the engine A control method,
In the energization control device, when performing mode switching between the power generation mode and the drive mode in accordance with an external command,
A first step of controlling the amount of current applied to the field winding;
In parallel with the control in the first step, the generator motor has a second step of performing vector control of the energization amount to the armature winding so as to compensate for fluctuations in the field current flowing in the field winding Control method.

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